Driving method and display device

Patent metadata

Field	Value
Publication number	US-11776450-B2
Application number	US-202217847202-A
Country	US
Kind code	B2
Filing date	Jun 23, 2022
Priority date	Jun 23, 2021
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

A driving method and a display device are disclosed. The driving method drives the display panel according to a common voltage look-up table, and the common voltage look-up table is generated by a method including: driving a preset area for display with a preset area gray-scale value; shooting the preset area and obtaining a brightness and a flicker value corresponding to the preset area; adjusting the common voltage value multiple times, and recording the common voltage value when the corresponding flicker value is the minimum as the optimal common voltage value; adjusting the preset area gray-scale value multiple times, and recording a plurality of optimal common voltage values corresponding to the adjusted preset area gray-scale values; and generating the common voltage look-up table according to the multiple preset area gray-scale values and the corresponding optimal common voltage values.

First claim

What is claimed is:

1. A driving method for driving a display panel according to a common voltage look-up table, the driving method comprising:
obtaining an area gray-scale value of a preset area of the display panel;
obtaining an optimal common voltage value corresponding to the area gray-scale value from a common voltage look-up table corresponding to the preset area, and outputting the optimal common voltage value to a common electrode of the preset area to drive the display panel for display;
wherein the common voltage look-up table is generated by a method comprising:
driving the preset area for display with a preset area gray-scale value;
shooting the preset area, and obtaining a flicker value corresponding to the preset area;
adjusting the common voltage value a plurality of times, and recording the common voltage value when the flicker value is the minimum as the optimal common voltage value;
adjusting the preset area gray-scale value a plurality of times, and recording a plurality of optimal common voltage values corresponding to the plurality of adjusted preset area gray-scale values;
generating the common voltage look-up table based on the plurality of preset area gray-scale values and the corresponding optimal common voltage values;
writing the common voltage look-up table into a memory of a timing control chip; and
performing a re-power-on test, using the optimal common voltage value of the common voltage look-up table corresponding to the preset area to drive the display panel for display, re-obtaining a flicker value and determining whether the flicker value meets a preset requirement; in response to determining that the optimal common voltage value meets the preset requirement, deciding that the optimal common voltage value is qualified; otherwise in response to determining that the optimal common voltage value does not meet the preset requirement, re-testing and generating a new common voltage look-up table, and rewriting and testing the new common voltage look-up table until it is decided as qualified.

2. The driving method of claim 1 , wherein there are at least two preset areas, each of which corresponding to a respective common voltage look-up table; the common voltage look-up table corresponding to at least one of the at least two preset areas is different from the common voltage look-up tables corresponding to other preset areas;
wherein at least one same preset gray-scale value in different common voltage look-up tables corresponds to different optimal common voltage values.

3. The driving method of claim 1 , wherein the display panel is equally divided into nine preset areas;
wherein the operation of obtaining the area gray-scale value of the preset area of the display panel comprises:
obtaining the respective area gray-scale values of the nine preset areas;
wherein the operation of obtaining the optimal common voltage value corresponding to the area gray-scale value from the common voltage look-up table corresponding to the preset area and outputting the common voltage value to the common electrode of the preset area to drive the display panel for display comprises:
obtaining the optimal common voltage values corresponding to the area gray-scale values in the nine preset areas from the common voltage look-up tables corresponding to the nine preset areas, respectively, and outputting the optimal common voltage values to the common electrodes of the nine preset areas to drive the nine preset areas of the display panel for display.

4. The driving method of claim 1 , wherein in the operation of obtaining the optimal common voltage value corresponding to the area gray-scale value from the common voltage look-up table corresponding to the preset area, and outputting the optimal common voltage value to the common electrode of the preset area to drive the display panel for display, the optimal common voltage value is output to the common electrode of the preset area during a row idle time of the scan line to drive the display panel for display.

5. A display device, comprising a display panel and a driving circuit, wherein the driving circuit uses is configured to perform a driving method comprising:
obtaining an area gray-scale value of a preset area of the display panel;
obtaining an optimal common voltage value corresponding to the area gray-scale value from a common voltage look-up table corresponding to the preset area, and outputting the optimal common voltage value to a common electrode of the preset area to drive the display panel for display;
wherein the common voltage look-up table is generated by a method comprising:
driving the preset area for display with a preset area gray-scale value;
shooting the preset area, and obtaining a flicker value corresponding to the preset area;
adjusting the common voltage value a plurality of times, and recording the common voltage value when the flicker value is the minimum as the optimal common voltage value;
adjusting the preset area gray-scale value a plurality of times, and recording a plurality of optimal common voltage values corresponding to the plurality of adjusted preset area gray-scale values;
generating the common voltage look-up table based on the plurality of preset area gray-scale values and the corresponding optimal common voltage values;
writing the common voltage look-up table into a memory of a timing control chip; and
performing a re-power-on test, using the optimal common voltage value of the common voltage look-up table corresponding to the preset area to drive the display panel for display, re-obtaining a flicker value and determining whether the flicker value meets a preset requirement; in response to determining that the optimal common voltage value meets the preset requirement, deciding that the optimal common voltage value is qualified; otherwise in response to determining that the optimal common voltage value does not meet the preset requirement, re-testing and generating a new common voltage look-up table, and rewriting and testing the new common voltage look-up table until it is decided as qualified.

6. The display device of claim 5 , wherein there are at least two preset areas, each of which corresponding to a respective common voltage look-up table; the common voltage look-up table corresponding to at least one of the at least two preset areas is different from the common voltage look-up tables corresponding to other preset areas;
wherein at least one same preset gray-scale value in different common voltage look-up tables corresponds to different optimal common voltage values.

7. The display device of claim 5 , wherein the display panel is equally divided into nine preset areas;
wherein the operation of obtaining the area gray-scale value of the preset area of the display panel comprises:
obtaining the respective area gray-scale values of the nine preset areas;
wherein the operation of obtaining the common voltage value corresponding to the area gray-scale value from the common voltage look-up table corresponding to the preset area and outputting the common voltage value to the common electrode of the preset area to drive the display panel for display comprises:
obtaining the optimal common voltage values corresponding to the area gray-scale values in the nine preset areas from the common voltage look-up tables corresponding to the nine preset areas, respectively, and outputting the optimal common voltage values to the common electrodes of the nine preset areas to drive the nine preset areas of the display panel for display.

8. The display device of claim 5 , wherein in the operation of obtaining the optimal common voltage value corresponding to the area gray-scale value from the common voltage look-up table corresponding to the pres

Assignees

• Hkc Corp Ltd

Inventors

• Wang Mingliang
• Zheng Haoxuan

Classifications

• G09G3/2007 Primary

  Display of intermediate tones · CPC title

• G09G3/006 Primary

  Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309) · CPC title

• G09G3/3696

  Generation of voltages supplied to electrode drivers · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2320/0247

  Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes · CPC title